Reducing computed tomography radiation dose in diagnosing pulmonary embolism

Tamader Alrammah, Amani Alohaly, Kamal Albatsh


Background and Objective: Computed tomography angiography plays a major role in the diagnosis of pulmonary embolism. Radiation dose associated with it is a major concern; therefore it is important to optimize protocols and techniques to ensure minimum radiation dose.

Methods: The study compares two protocols i.e.  Conventional Timing Bolus CT protocol and  Delayed Timing Bolus protocol used to assist suspected pulmonary embolism patients.

Results: A significant reduction in the average effective dose (39%) was noticed when using the delayed timing bolus protocol.

Conclusion: Delayed timing bolus protocol has a good impact on radiation dose without affecting the value of the computed tomography angiography study.


How to cite this:AL-Rammah TY, Alohaly A, Albatsh K. Reducing computed tomography radiation dose in diagnosing pulmonary embolism. Pak J Med Sci. 2016;32(6):1444-1448.   doi:


This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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